碩士 / 國立臺北科技大學 / 電機工程系研究所 / 99 / Focusing on the Changhua Offshore Wind Farm with an assumed total capacity of 864 MW generated by Type C wind turbines (each turbine equipped with a capacity of 3.6 MW), the study aims at examining and evaluating the methods of connecting the offshore wind farm into the Taipower 2015 power systems. There emerge accordingly four major connection scenarios under examination: (1). The Xian Xi 161 kV bus (H5801) is selected as the location for single-connection method; (2). The Xian Xi 161 kV bus (H5801) and Han Bao 161 KV bus (H5817) are selected as the locations for separate-connection method; (3). The H5801 and H5817 buses are selected as the locations for multi-connection method; and (4). The Zhang Bin 345 kV bus (E2300) is selected as the location for single-connection method. PSS/E 29 is adopted as the simulation tool, and the Taipower Distribution System Planning Guidelines and the Technical Rules of Renewable Energy Generation Connected to Taipower Transmission and Distribution System have been consulted for performing various simulations, analyses, and evaluations and for verifying the simulation results. Main issues analyzed and simulated include: steady-state power flow, bus voltage variation before and after the connection, maximum three-phase short circuit current, transient stability, the critical range of the tripping of the wind farm caused by bus fault, and the impact of critical fault clearance time on the power system.
As indicated by the results of simulating the connection of the wind farm with a total capacity of 864 MW into the main power system, analysing steady-state power flow. According to the statistics during the peak period, Scenario 4 reports the least number of overload lines. No line is under overload in Scenario 4 as the wind farm is directly connected through the Zhang Bin 345 kV bus, bypassing the 161 kV power transmission lines. In terms of bus voltage variation (analysis based on the premise that wind turbines are in the power factor control mode), the light statistics suggest that only Scenario 4 sustains a voltage variation of -2.26% to 2.10% that falls within the required range (±2.5%). In terms of maximum three-phase short circuit current, different connection locations result in different gains in short circuit current. When Zhang Bin E2300 is used for comparison, Scenario 4 betrays the most gain with a maximum three-phase short circuit current since the wind farm is entirely directly connected at this location. In terms of transient stability, when the degree of voltage drop at Xian Xi is compared, both the light and peak statistics identify Scenario 1 as the connection method with lowest voltage drop as the wind farm is entirely connected via the Xian Xi bus, and the wind turbines would regulate reactive power to curb voltage drop when fault takes place. On the other hand, when the amplitude of swing in frequency at Xian Xii is compared, both the light and peak figures indicate that Scenario 4 reports an amplitude of swing that is closest to the standard of 60 Hz. Critical fault clearance time is an indicator of transient stability. In examining the critical fault clearance time, the study simulates two different cases. In Case 1 in which a fault occurs at the Zhang Bin E2300 bus and leads to the tripping of the first circuit connecting Zhang Bi E2300 and Zhong Huo Nan E540,and in Case 2 in which a fault occurs at the Zhang Bin E2300 bus and triggers the tripping of the first circuit connecting Zhang Bin E2300 and Quan Xing E2350. All statistics results are more than two times of taipower standard, and it means taipower system is very strong.
| Identifer | oai:union.ndltd.org:TW/099TIT05442097 |
| Date | January 2011 |
| Creators | Jian-Hong Pan, 潘建宏 |
| Contributors | Chao-Rong Chen, 陳昭榮 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 153 |
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